Speed-drill.



J. DUVAL.

SPEED DRILL.

APPLICATION FILED SEPT- 11. 1914.

1 148,,365u Patented July 27, 1915.

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JOHN DUVAL, OF GRAND JUNCTION, COLORADO.

SPEED-DRILL.

Application filed September 17, 1914.

To all whom it may concern:

Be it known that I, JOHN DUVAL, a citizen of the United States, residingat Grand Junction, in the county of Mesa and State of Colorado, haveinvented a new and useful Speed-Drill, of which the following is aspecification.

The invention relates to improvements in drills.

The object of the present invention is to improve the construction ofdrills and to provide a simple, practical, and efficient tool which willbe smooth and easy in its operation, and capable of rapidly boringeither metal or wood.

\Vith these and other objects in view the invention consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawing, and pointed out in the claimsappended hereto, it being understood that various changes in the form,proportion, size and minor details of construction, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing, Figure 1 is a side elevation of a speed drillconstructed in accordance with this invention. Fig. 2 is an en largedsectional view through the case, the gears and ball bearing being shownin ele vation. Fig. 3 is a similar view, the gears and ball bearingbeing shown in section. Fig. 4 is a sectional view through the gear caseon the line 4l4: of Fig. 2. Fig. 5 is a sectional view through the caseon the line 5-5 of Fig. 3. Fig. 6 is a detail sectional view through oneof the sections of the case.

Like numerals of reference designate corresponding parts in all thefigures of the drawing.

In the accompanying drawing, in which is illustrated a practicalembodiment of the invention, the drill comprises in its construction abrace member 1 having a crank bend 2 carrying a rotary handle 3 of theordinary construction. The brace member 1 is provided at its inner orrear end with a rotary head or stock 4, adapted, when the tool is usedby carpenters for wood boring, to be arranged in the pocket of the beltcommonly employed by such mechanics. The outer terminal portion of thebrace member constitutes a shaft section 5, arranged in alinement with achuck shaft section 6, which carries a bit chuck 7 of any preferred conSpecification of Letters Patent.

Patented July 2'7, 1915.

Serial No. 862,228.

struction. The shaft sections 5 and 6 are tangular gear case 10, dividedcentrally in a plane in parallelism with the side faces of the gear caseto form two similar sections 11. The sections 11, which have interiorrecesses to form a chamber 12, are provided at their inner and outerends with similar exterior attaching flanges 13, secured together byscrews 14 or other suitable fastening device, and provided with the saidbearings 8 and 9, and also with alined bearings 14: for the reception ofa counter-shaft 15, which is connected by inner and outer sets of gearswith the shaft sections 5 and 6.

The shaft section 5 has its terminal 16 reduced to form a terminaljournal which fits in a bearing socket 17 in the inner end of the shaftsection 6. The said shaft section 5 has suitably'fixed to it a spur gearwheel 18, which meshes with a spur pinion 19, suitably fixed to theinner portion of the countershaft 15. The counter-shaft has mounted onits upper portion a spur gear wheel 20, which meshes with a spur pinion21 of the shaft section 6. The outer set of gears is suitably fixed tothe countershaft and the outer shaft section 6, and the inner and outersets may be of any desired diameters to increase the speed of the outershaft section6 and the bit chuck carried thereby, to the desired extent.lVhen-the brace member is turned in the usual manner, motion iscommunicated therefrom through the inner and outer sets of gears to theouter shaft section 6, which is rotated at a relatively high rate ofspeed, thereby effecting rapid boring either in metal or wood.

In order to render the drill or brace easy running, a ball bearing isinterposed between the gear wheel 18 of'the inner shaft section 5 andthe pinion 21 of the outer shaft section 6. The ball bearing, which issupported in recesses 22 of alined abutting transverse webs 23 of thesections of the gear case, is composed of race way plates 24', havingoppositely faced channels for the reception of anti-friction balls 25and arranged in a retaining or holding ring 26. The ring 26, which isflanged at its side edges to partially embrace the race way plates, fitssnugly within the opening formed by the recesses 22 of the webs 23. Theantifriction balls are interposed between the race way plates, whichcontact with the gearwheel 18 and the pinion 21. The said plates 2% areadapted to rotate independently of each other and reduce the friction toa minimum and provide a smooth, easy running tool. The ball bearing hasa central openinginto which extend the interfitting ends of the shaftsections 5 and 6.

One of the sections of the gear case is equipped with a handle 27,which, in the use of the tool, is conveniently held in the chuck shaftsection also journaled in the gear case, said shaft sections beingarranged in alinement and having contiguous inner ends, gears mountedonthe said shaft sectionsand arranged in spaced relation at the inner endsof the same, and an annular ball bearing surrounding the inner ends ofthe shaft sections and interposed between the said gears, said ballbearing having independently rotatable plates in contact with the gears,a countershaft carried by the gear case, and other gears mounted on thecountershaft and meshing with the said gears.

2. A tool ofthe class described including a gear case composed ofsections fitted together and having bearings at their meeting edges,said gear case being also provided with abutting webs provided withregistering recesses forming an opening, a brace member having a shaftsection journaled in one of the bearings, a bit chuck shaft sectionalined with the said shaft section and journaled in a bearing of thegear case, a countershaft journaled in other bearings of the gear case,separate sets of inner and outer gears connecting the countershaft withthe shaft sections, and a ball bearing mounted within the opening of thesaid webs and interposed between the gears of the shaft sections andhaving independently rotatable portions in contact with the said gears.

8. A tool of the class described including a gear case divided on theplane in substantial parallelism with its side faces to form twosections, the latter having front and rear abutting attaching flangesprovided with inner and outer pairs of bearings, said sections beingalso provided with alined abutting webs having registering recessesforming an opening, a brace member having a shaft section journaled inone of the inner bearings, a bit chuck shaft section alined with thesaid shaft section and journaled in one of the outer bearings, saidshaft sections having interfitting ends located at the opening formed bythe webs, a countershaft journaled in the otherv bearings of the gearcase, inner and outer sets of gears mounted on the countershaft and theshaft sections, and a ball bearing arranged within the opening of thesaid webs and surrounding the interfitting ends of the shaft sectionsand having independently rotatable portions in contact with the gears ofthe shaft sections.

In testimony that I claim the foregoing as my own, Ihave hereto atlixedmy signature in the presence of two witnesses.

JOHN DUVAL.

Witnesses r R. E. STARR, l/V M. CAMPBELL.

Copies of this patent mayv be obtained for five cents each, byaddressing the Commissioner of Patents,

7 Washington, D. C.

